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ALSA: usb-audio: fix uac control query argument

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This patch fixes code readability and should have no functional change.

Correct uac control query functions to account for the 1-based indexing
of USB Audio Class control identifiers.

The function parameter, u8 control, should be the
constant defined in audio-v2.h to identify the control to be checked for
readability or writeability.

This patch fixes all callers that had adjusted, and makes explicit
the mapping between audio_feature_info[] array index and the associated
control identifier.

Signed-off-by: Andrew Chant <achant@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Andrew Chant 2018-03-22 14:39:55 -07:00 • committed by Takashi Iwai
parent 9a2fe9b801
commit 21e9b3e931
3 changed files with 48 additions and 30 deletions
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4
include/linux/usb/audio-v2.h
View file

@ -36,12 +36,12 @@
static inline bool uac_v2v3_control_is_readable(u32 bmControls, u8 control)
{
return (bmControls >> (control * 2)) & 0x1;
return (bmControls >> ((control - 1) * 2)) & 0x1;
}
static inline bool uac_v2v3_control_is_writeable(u32 bmControls, u8 control)
{
return (bmControls >> (control * 2)) & 0x2;
return (bmControls >> ((control - 1) * 2)) & 0x2;
}
/* 4.7.2 Class-Specific AC Interface Descriptor */